Question

determine o 30° termo do p.a 40, 60

Answer 1

P.A. com sequência {40, 60} variou 20.

Logo, 
                40 + 29.20 = a30
                a30 = 98

Answer 2

(40,60,80,100,120,140,160,180,200,220,240,260,280,300,320,340,360,380,400,420,440,460,
480,500,520,540,560,580,600,620)

Razão 20